No CPU vCore Offset option.
I donât know what exactly is vCore, but there are options to adjust the offset voltage of CPU, GPU, SOC, memory controller and others. Just they are named differently. And you must accept the oveclocking warning to enter that page. In every BIOS you should look for the corresponding function and not for a special name, because the names are irrelevant.
Asrock sent me a custom BIOS 1.80.RC.02.SS01 with AGESA 1.2.0.C and Spread Spectrum completely disabled:
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I understand what youâre saying but believe me, there is no Vcore Offset option. I would be happiest if there wasâŚ
I found tens of voltage offset settings, but there are too many so I donât really know, maybe there isnât. I read that these modern chips have 3-4 different voltages. I am not interested in overclocking on the DeskMini, because when running Prime95 at stock speed with that well known Noctua cooler, the internal chip temperature reaches 95C and start dropping boost frequencies. The X300 is not for oveclocking anywhay.
This BIOS that I posted is very interesting because the clock is stable, without modulation, gives a little more performance at stock, it is easier and more pleasant to monitor frequencies and has all known security patches included.
I do not want to overclock the CPU⌠(negative offset)
Then I suggest to put the power on 45W or 35W, the voltage and consumption will go down automatically.
I received a v1.90 BIO with ACS enabled by default (cannot be turned off) from ASRock. In theory it should enable IOMMU groups without the pcie_acs_override=downstream kernel param that wrecks security, and do whatever the equivalent of ARI enumeration does.
There is a risk that itâs compatible wth Cezanne (5xxx series) only and may completely stop booting with older chips. Tested and compatible even with Renoir. [CTRL-Q] âSecretâ menu in Advanced tab has things like 4x4 bifurcation and âthunderbolt enableâ. There are so many options, even vCore might be there @Archttila âŚ
https://drive.google.com/drive/folders/1nJV-svR1Qp8UnVriRvlruy3rCk_Y-K_E?usp=sharing
Based on this, I would like to request a UEFI version that includes a CPU vCore option. 
Advanced\AMD Overclocking\Accept\Manual CPU Overclocking â CPU Voltage
âSpecify a custom CPU core voltage (mV).â
Is that what you want?
Edit:
Advanced\AMD Overclocking\Accept â CPU Voltage:
CCD0 â CCX0 Frequency, CCX1 Frequency
CCD1 â CCX0 Frequency, CCX1 Frequency
Looks like I can control each CPU core voltage individually.
A custom CPU core voltage and CPU vCore Offset are two different things⌠but thank you anyway!
I have received a new customized BIOS for X300 with AGESA 1.2.0.E and Spread Spectrum disabled.
The new AGESA protects against altering the microcode of the CPU !
SS disabled means that the base frequency is more near 100 MHz and is not fluctuating anymore. Spread Spectrum modulation is required only to pass FCC certifications and it fluctuates frequency periodically BELOW the standard frequency (even if all sources say âbelow and aboveâ).
SS comes from an age of analogic world, with AM radios and antenna TVs. There is now far more interference from your pulse modulated 4G or 5G phone, wireless modem, bluetooth and any intelligent metters than from a computer mainboard placed inside a Faraday metal cage.
Base clock rapid fluctuations due to SS modulation are known to introduce instabilities in the system, including when it is not oveclocked. Beside that, it is very annoying when one wants to monitor exaclty the core clocks during some benchmarking or intensive processing.
The median frequency is only a little below the standard, but it is multiplied by the core multiplier, so the difference becomes as large as 10-20 MHz, loosing performance and rapidly fluctuating, introducing instabilities.
All mainboard manufacturers have an option to disable this and it is the first thing I am altering when entering the BIOS for the first time, for more that 30 years now, without any downsides. But the X300 simply doesnât provide such an option !
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